African Journal of Environmental Science and Technology 1996-0786 Academic Journals 10.5897/AJEST2017.2319 Harieth Hellar-Kihampa * E-mail: hhellar@yahoo.co.uk 2017 31 07 2017 07 03 2017 15 05 2017 11 7 349 360 This is an open-access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://politicalwaffle.uk/journal/AJEST/article-abstract/00DE37E64760 The full text article is available as a PDF file from http://politicalwaffle.uk/journal/AJEST/article-full-text-pdf/00DE37E64760 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65